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Corticobulbar fibre

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Corticobulbar fibre

(Science: physiology) nerve fibres projecting from the motor and somatic sensory cortex to the rhombencephalon.

included in this corticofugal fibre system are corticoreticular fibres terminating in the reticular formation of the rhombencephalon, and corticonuclear fibres to the motor nuclei innervating the musculature of the face, tongue, and jaws, and to some fibres of the rhombencephalic sensory relay nuclei.

They terminate directly on some motor cranial Nerve nuclei, in the reticular formation, and on sensory relay nuclei, such as the cuneate nucleus and gracile nucleus and the spinal trigeminal nucleus.

See: corticobulbar tract.